Duration time stamp jumps around in VLC playing downloaded radio.

[MS]

Hi,

Note using the PPA: ppa:jon-hedgerows/get-iplayer
get_iplayer 2.84-2-g21e11de-ppa15
RTMPDump v2.4-n78-git3a1e20c-ppa8~precise
avconv version 0.8.9-4:0.8.9-0ubuntu0.12.04.1
VLC media player v. 2.0.8

OS: Linux Mint 13 'Maya' LTS (basically Ubuntu 12.04 LTS 'Precise Pangolin')

Recently I installed Mint 13 having been using Ubuntu 10.04 LTS 'Lucid 
Lynx' until last week.

The following has started happening since the new OS was installed:

When playing radio programmes I've downloaded using get_iplayer in VLC 
the duration time jumps around instead of displaying an accurate fixed 
time, it constantly changes (usually in the region of 2-3 mins longer 
than the real duration). The playing time works correctly, each second 
ticking over at the correct rate, and the audio plays fine.

I can fix this by re-encoding the downloaded MP3 file with Lame, e.g. 
below. Once this is done the duration time works normally showing an 
accurate fixed time as you would expect.

lame -V 2 InFile.mp3 OutFile.mp3

My standard radio download command is:

gip --type=radio --modes=best --force --aactomp3 --mp3vbr 2 --get num

However all the variations I've tried also result in the same problem. e.g.

gip --type=radio --modes=best --force --aactomp3 --get num

gip --type=radio --modes=best --force --aactomp3 --mp3vbr 0 --get num

gip --type=radio --force --aactomp3 --mp3vbr 0 --get num

Adding "--lame /usr/bin/lame" also made no difference but I don't think 
Lame was even used, so probably this option applies to something else.

I get these messages in my terminal but I think I've always had them in 
the past (certainly the 'Estimating duration' one) or something similar?!

...Download complete
avconv version 0.8.9-4:0.8.9-0ubuntu0.12.04.1, Copyright (c) 2000-2013 
the Libav developers built on Nov  9 2013 19:08:00 with gcc 4.6.3
[flv @ 0x153a9c0] max_analyze_duration reached
[flv @ 0x153a9c0] Estimating duration from bitrate, this may be inaccurate
Input #0, flv, from '/my/edit/path/to/file.partial.mp3.flv...

Any ideas what's going wrong and how to fix this?

Thanks.